minor #1400 appveyor.yml - add file (keradus)
minor #1400 appveyor.yml - add file (keradus)

This PR was merged into the 1.11 branch.

Discussion
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appveyor.yml - add file

Let's keep this PR minimal and then, if we want to, extend jobs run on AppVeyor in separate PR

Commits
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e50285d appveyor.yml - add file

Slamdunk/PHP-CS-Fixer,Soullivaneuh/PHP-CS-Fixer,keradus/PHP-CS-Fixer,lucasmichot/PHP-CS-Fixer,felixgomez/PHP-CS-Fixer,lmanzke/PHP-CS-Fixer,SpacePossum/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,felixgomez/PHP-CS-Fixer,macik/PHP-CS-Fixer,macik/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,SpacePossum/PHP-CS-Fixer,lmanzke/PHP-CS-Fixer,Soullivaneuh/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,keradus/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,gharlan/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,lucasmichot/PHP-CS-Fixer,Slamdunk/PHP-CS-Fixer,gharlan/PHP-CS-Fixer